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HeadPhone.c：源码内容
							
/****************************************************************************************
 *  Copyright (c) 2002 ZORAN Corporation, All Rights Reserved
 *  THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF ZORAN CORPORATION
 *
 *  File: $Workfile: HeadPhone.c $             
 *
 * Description: detect HeadPhone status
 * 
 ****************************************************************************************/
#include "Config.h"		// Global Configuration - do not remove!
#ifdef D_ENABLE_HEADPHONE_DETECT
#include "Includesysdefs.h"
#include "Kernelker_api.h"
#include "KernelEventDef.h"
#include "Decoderdecoder.h"
#include "PlaycoreCoremaincoregdef.h"
#include "PlaycorePSps.h"
#include "PlaycoreHeadPhoneHeadPhone.h"
static BOOL gb_HeadPhone_Detected = FALSE;
static HEADPHONE_STATE b_last_HeadPhone_Detected = HEADPHONE_PLUG_OUT;
static int	g_HeadPhoneInProcess = 0;
#ifndef COUNTER_TO_DEACTIVATE_HEADPHONE
	#define COUNTER_TO_DEACTIVATE_HEADPHONE		80
#endif
#ifndef COUNTER_TO_ACTIVATE_HEADPHONE
#define COUNTER_TO_ACTIVATE_HEADPHONE		80
#endif
void SetHeadPhone(void);
int HeadPhoneDetection(void);
void HeadPhoneDetectionInit(void);
	
/**************************************************************************
*
*	Function : SetHeadPhone
*
*	In	: void
*	Out	: void
*
*	Return : void 
*
*	Desc : send message to decoder when HeadPhone is plug in/out
*
***************************************************************************/
void SetHeadPhone(void)
{
	static UINT16 count = 0x0;
	DWORD dCmd;
	if (TRUE == gb_HeadPhone_Detected)
	{
		if(HEADPHONE_PLUG_OUT == b_last_HeadPhone_Detected)
		{
			count = 0x0;
			b_last_HeadPhone_Detected = HEADPHONE_PLUG_IN;
		}
		else
		if(count < COUNTER_TO_ACTIVATE_HEADPHONE)
		{
			count++;
		}
		else if(HEADPHONE_PLUG_IN != gtps.mHeadPhone)
		{
			dCmd = (((DWORD)PS_UPDATE_HEADPHONE_SETTING)<<16) + (DWORD)HEADPHONE_PLUG_IN;
			k_ie_send_ex(IE_CORE_UPDATE_PS, (void *)dCmd);
			count = 0x0;
		}
	}
	else
	{
		if(HEADPHONE_PLUG_IN == b_last_HeadPhone_Detected)
		{
			count = 0x0;
			b_last_HeadPhone_Detected = HEADPHONE_PLUG_OUT;
		}
		else		
		if(count < COUNTER_TO_DEACTIVATE_HEADPHONE)
		{
			count++;
		}
		else if(HEADPHONE_PLUG_OUT != gtps.mHeadPhone)
		{
			dCmd = (((DWORD)PS_UPDATE_HEADPHONE_SETTING)<<16) + (DWORD)HEADPHONE_PLUG_OUT;
			k_ie_send_ex(IE_CORE_UPDATE_PS, (void *)dCmd);
			count = 0x0;
		}
		
	}
	g_HeadPhoneInProcess = 0x0;
}
/**************************************************************************
*
*	Function : HeadPhoneDetection
*
*	In	: void
*	Out	: void
*
*	Return : TRUE if Headphone plug in, FALSE else
*
*	Desc : 
*
***************************************************************************/
int HeadPhoneDetection(void)
{
	gb_HeadPhone_Detected = ioHeadPhoneDetection();
	return TRUE;
}
/**************************************************************************
*
*	Function : HeadPhoneDetectionInit
*
*	In	: void
*	Out	: void
*
*	Return : void
*
*	Desc : 
*
***************************************************************************/
void HeadPhoneDetectionInit(void)
{
	/* Install the callback function for Vocal Detection and Set */
	DEC_install_fast_callback(HeadPhoneDetection, SetHeadPhone, &g_HeadPhoneInProcess);
}
#endif

						